PAD Services

Remote PAD Printer Support (x29printd)
CAUTION

Use extreme caution when specifying applications other than the default (login) application. Since the x29server process is started with superuser privileges, it gives root privileges to applications triggered by incoming calls.

You can automatically launch a user application by:

•configuring the application field with the relevant application name as its value without specifying the cud field. The application name must be the full path name of the application to be launched.

•configuring the application field with the application name and setting the cud field to yes. In this case, the cud field is considered as the argument to the application. The application name must be the full path name of the application to be launched.

•not including the application field and setting the cud field to yes. This allows the application to be defined by the incoming Call Request Packet.

The first four bytes of the CUD field (in call request packets) are NOT part of the application’s full path name. The first four bytes are used for protocol ID as explained in the section “Call acceptance mechanism and system security.”

Remote PAD Printer Support (x29printd)

Overview

The x29printd user-level program provides support for printers attached to remote PADs. It accesses X.25 level 3 through Berkeley Sockets (programmatic interface). It also has an interface to special PTYs (see illustration below).

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Chapter 6